Documentation Request: Batch Job Status

When a batch job completes, how do we programmatically know

* If all batch jobs completed successfully.
* Which jobs failed?

In our case if a batch completes and its awaiting job does its cleanup work, we want it to be able to report / alert us of there were issues.

No documentation file, test, or entry point is named. Start by locating the existing batch-job and awaiting-job documentation, then document how a cleanup job can determine whether all jobs succeeded and identify failures, with the issue considered done when both questions are answered clearly.

Written by the indexing model from the issue text.